gate various label-related transformations (#3812)

2020-04-22 22:27:26 +01:00
parent 01b13d797c
commit 3ae24329eb
4 changed files with 17 additions and 2 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -3962,11 +3962,12 @@ merge(Compressor.prototype, {
    });

    OPT(AST_LabeledStatement, function(self, compressor) {
-        if (self.body instanceof AST_Break
+        if (compressor.option("dead_code")
+            && self.body instanceof AST_Break
            && compressor.loopcontrol_target(self.body) === self.body) {
            return make_node(AST_EmptyStatement, self);
        }
-        return self.label.references.length == 0 ? self.body : self;
+        return compressor.option("unused") && self.label.references.length == 0 ? self.body : self;
    });

    OPT(AST_Block, function(self, compressor) {